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Strategic Formation of Coalitions

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  • Jinpeng Ma

    (Economics, Rutgers University, Camden, NJ 08102)

Abstract

Consider a society with a finite number of individuals. A coalition structure is a partition of the set of individuals. Each individual has personal preferences over the set of all coalition structures. We study the strategy proof core and von Neumann and Morgenstern (vN&M) solutions. A roommate problem is a problem in which each coalition in each coalition structure contains at most two members. We show that as long as the core is single-valued, the core is coalitionally strategy proof. Moreover the core mechanism is completely characterized by three properties: strategy proofness, Pareto optimality and individual rationality, in the domain with single-valued core. The single-valued core defines the largest domain one may obtain such a mechanism. We show in an example that the single-valued core is manipulable if coalition structures allow more than two members. Nevertheless we show that the single-valued vN&M solution is coalitionally stratey proof and it is individually rational and Pareto optimal. In fact the vN&M solution is the only mechanism with the three properties in the domain with single-valued vN&M solution.

Suggested Citation

  • Jinpeng Ma, 1998. "Strategic Formation of Coalitions," Departmental Working Papers 199810, Rutgers University, Department of Economics.
    • Handle: RePEc:rut:rutres:199810
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    References listed on IDEAS

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    Cited by:

    1. Ehlers, Lars, 2018. "Strategy-proofness and essentially single-valued cores revisited," Journal of Economic Theory, Elsevier, vol. 176(C), pages 393-407.

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    Keywords

    the core;

    JEL classification:

    • D40 - Microeconomics - - Market Structure, Pricing, and Design - - - General

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